I'm currently also in the UK 'heatwave' at a blistering 26-28C most of the day and night, sometimes rising to 30C by midday. I'm brewing saisons.
On the subject of fusel alcohol/esters etc, I've not really encountered them yet despite pitching a S-04 at about 30C the other month and fermenting ales at 20-21C earlier in the year. Not trying much 'lager' though!
Boohoo! 30 °C is not hot mate! Try 38 and >65% humidity!! Not sure when I'll be brewing next but I guess I'll have to wait out the nice US Northeast heat wave...
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